CN114674752A - Multiply gas absorption white pond - Google Patents
Multiply gas absorption white pond Download PDFInfo
- Publication number
- CN114674752A CN114674752A CN202210420030.2A CN202210420030A CN114674752A CN 114674752 A CN114674752 A CN 114674752A CN 202210420030 A CN202210420030 A CN 202210420030A CN 114674752 A CN114674752 A CN 114674752A
- Authority
- CN
- China
- Prior art keywords
- mirror
- light
- multiplication
- emergent
- white cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optical Measuring Cells (AREA)
Abstract
The invention relates to the technical field of white cells, in particular to a multiple multiplication type gas absorption white cell which comprises a main mirror, two secondary mirrors, a light incidence end and a light emergent end, wherein the main mirror, the two secondary mirrors, the light incidence end and the light emergent end form a typical white cell, and further comprises a multiplying mirror group, the multiplying mirror group comprises a plane reflecting mirror and a plano-concave cylindrical surface reflecting mirror, the plane reflecting mirror is opposite to the mirror surface of the plano-concave cylindrical surface reflecting mirror and forms an included angle for fixing, the multiplying mirror group receives emergent light of the secondary mirrors, the emergent light is subjected to position offset and is used as new incident light to be re-emitted into the typical white cell, and reflection which is at least twice more than the optical path of the typical white cell is completed. Only one multiplication lens group is added, and the multiplication lens group is fixed at a proper position in a proper size, so that multiple multiplication of the optical distance of a typical white cell can be realized.
Description
Technical Field
The invention relates to the technical field of gas absorption tanks, in particular to a multiply gas absorption white tank.
Background
The optical white cell is a gas absorption cell which realizes a long optical path by reflecting light beams back and forth for multiple times in a cell body.
In the prior art, the concentration of gas is usually detected by adopting the Lambert-Beer law, and the principle is as follows: when the infrared beam passes through the gas to be detected, the gas absorbs the infrared signal. From Lambert-Beer's law, the gas molecule absorbance is proportional to the absorption optical path, the gas molecule concentration and the gas molecule absorption coefficient. While different gas molecules have different gas molecule absorption characteristics. Therefore, the concentration of the absorbed gas molecules can be quantitatively inverted by performing spectral analysis on the absorbance spectrum after the gas absorption. With the increasing requirement for precision in the field of gas detection, the optical path of the optical gas absorption cell needs to be further increased. Requiring a longer optical path in a confined space requires an absorption cell to achieve more reflections.
The increase in optical length causes two problems: 1. the optical absorption cell has large volume, which causes the instrument to be heavy, 2, the optical path is long, the reflection times are increased, which causes the light intensity to be low and the signal-to-noise ratio to be poor.
Chinese patent (application publication No. CN 106290218A) discloses an ultra-micro gas concentration detection system, which uses a corner mirror to turn a light path to increase the light path, and has the following disadvantages: 1. when the corner reflector is used, light beams can escape from the secondary mirror, so that the light intensity can be greatly reduced; 2. the corner reflector is difficult to install and debug; 3. the optical path is only increased by one time when the corner reflector is added, and if the optical path is increased by multiple times, the corner reflector needs to be installed, so that the system is overlarge in size, and the installation and debugging difficulty is further increased.
The chinese patent is an optical path multiplying device and an optical path multiplying gas absorption cell (application publication No. CN113484266A), which adds a multiplying mirror on the basis of a typical white cell optical structure, and has the following disadvantages: 1. the optical reflection times can be increased by only one time; 2. the incident position and the emergent position of the light are very close, so that the light source and the detector are inconvenient to install.
Disclosure of Invention
The invention aims to provide a multiple multiplication type gas absorption white cell, which solves the problems that the optical path of a multiplication mirror is increased by only one time, the light intensity is weakened after light is reflected for multiple times, the system is large in size, and the system is difficult to install and debug in the conventional white cell.
In order to achieve the purpose, the invention provides the following technical scheme:
a multiply-multiplied gas-absorption white cell, comprising: the invention comprises a main mirror, two secondary mirrors, a light incidence end and a light emergent end, wherein the main mirror, the two secondary mirrors, the light incidence end and the light emergent end form a typical white cell, and on the basis of the prior art, the invention also makes the following improvements: still include the multiplication mirror group, the multiplication mirror group includes plane mirror and plano-concave cylindrical reflector, the plane mirror is relative and be the contained angle fixed with plano-concave cylindrical reflector's mirror surface, the emergent light of secondary mirror is accepted to the multiplication mirror group to incite into typical white pond once more as new incident light with emergent light position offset, accomplish the reflection that is more than typical white pond optical path at least one time.
Preferably, the primary mirror, the first secondary mirror and the second secondary mirror are all spherical mirrors, and the curvature radiuses of the spherical mirrors are the same.
Preferably, an included angle between the plane mirror and the plano-concave cylindrical mirror is denoted by α, the curvature radius of the primary mirror is denoted by R, the focal length of the plano-concave cylindrical mirror is denoted by R2, and R2 satisfy the relationship: r2 ═ R/cos (α/2).
Preferably, the angle α between the plane mirror and the plano-concave cylindrical mirror is 90 °, and R2 satisfy the relationship:
preferably, the plane mirror is directly bonded at the position of the emergent light of the primary mirror, or the size of the primary mirror is reduced, and the plane mirror is fixed in the region where the emergent light deviates from the primary mirror.
Preferably, the light incident end and the light emitting end are separately disposed at one side of the main mirror.
Compared with the prior art, the invention has the beneficial effects that:
1. only one multiplication lens group is added and fixed at a proper position in a proper size, so that multiple multiplication of the optical path of a typical white cell can be realized;
2. the size of the main mirror can be reduced, the use of two plane reflectors is reduced, and the difficulty of dimming is reduced;
3. when the optical path is the same, the light source of the white cell is close to the central axis, and the aberration is small.
Drawings
FIG. 1 is a schematic diagram of a typical white cell of the prior art;
FIG. 2 is a schematic diagram of the spot positions of a typical white cell primary mirror of the prior art;
FIG. 3 is a schematic structural view of a multiply-multiplied gas absorption white cell according to the present invention;
fig. 4 is a schematic diagram of the light spot position of the multiply gas absorption white primary mirror according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The optical principle of a typical white cell in the prior art is shown in fig. 1, the white cell is composed of three spherical reflectors with the same curvature radius, incident light is reflected to a secondary lens 1 through a plane reflector 1, is reflected to converge to a primary lens through the secondary lens 1 to form a light spot, is reflected to a secondary lens 2 through the primary lens, and is reflected to converge to the primary lens through the secondary lens 2 to form a light spot again, the light shown in the embodiment is reflected for 16 times and exits through the plane reflector 2 to form 7 light spots on the primary lens, and the positions of the 7 light spots on the primary lens are shown in fig. 2. The typical white cell can adjust the optical path by adjusting the reflection times of the incident light.
Referring to fig. 3 to 4, the multiple multiplication type gas absorption white cell of the present embodiment is further improved over a technical scheme of a typical white cell in the prior art, the white cell of the present embodiment includes a primary mirror 1, two secondary mirrors (a primary mirror 2 and a secondary mirror 3), a light incident end and a light emitting end, the light incident end emits incident light, the light receiving end receives emergent light, the light incident end and the light emitting end of the present embodiment are separately disposed on one side of the primary mirror 1, and light passes through the primary mirror 1 by drilling holes. The main mirror 1, the two secondary mirrors, the light incidence end and the light emergent end form a typical white cell, and light is reflected back and forth between the main mirror and the secondary mirrors.
On the basis of the prior art, the embodiment is further improved as follows: the gaseous white pool that absorbs of formula of multiplying many times of this embodiment still includes the multiplication mirror group, the multiplication mirror group includes plane mirror 4 and plano-concave cylindrical reflector 5, plane mirror 4 is relative and is contained angle alpha fixed with plano-concave cylindrical reflector 5's mirror surface, the emergent light of secondary mirror is accepted to the multiplication mirror group to incite into typical white pool once more as new incident light with emergent light position offset, accomplish and be more than the reflection of typical white pool optical distance one time at least.
As shown in fig. 1, in a typical white cell, the 7 th light spot formed on the primary lens is an emergent light spot, and if the multiplier lens group of this embodiment is directly installed in the region where the emergent light spot is located, multiple times of optical path multiplication can be realized. Specifically, as shown in fig. 3, light reflected from the first secondary mirror 2 should form a 7 th light spot on the primary mirror 1, but a multiplier mirror group is installed in the region, so that the light directly enters the plane mirror 4, is reflected by the plane mirror 4 and enters the plano-concave cylindrical mirror 5, is emitted by the plano-concave cylindrical mirror 5 and then enters the first secondary mirror 2 again, and then enters the primary mirror 1 after being reflected by the first secondary mirror 2, so that the light is shifted to generate the 7 th light spot shown in fig. 4, and under the action of the multiplier mirror group, emergent light of an original typical white cell is reflected back to the first secondary mirror 1 and is reflected back and forth in the typical white cell again as new incident light, thereby doubling the optical path. In this embodiment, fig. 3 shows that the light rays are incident into the multiplier lens group twice, that is, the light rays are shifted twice and double multiplication is completed, and fig. 4 shows the position relationship of the light spots on the primary mirror 1 after double multiplication. The multiplying mirror group of this embodiment can specifically complete several times of optical path multiplication, which is determined according to the size and the installation position of the used plane mirror 4 and the plane concave cylindrical mirror 5, that is, on the premise of not shielding the light incident end and the light emergent end, the multiplying mirror group is set to have a proper size and installed at a proper position to realize multiple times of optical path multiplication.
In a preferred embodiment of the present invention, the primary mirror 1, the first secondary mirror 2, and the second secondary mirror 3 are all spherical mirrors, and have the same radius of curvature.
An included angle between the plane mirror 4 and the plano-concave cylindrical mirror 5 is recorded as alpha, the curvature radius of the primary mirror 1 is recorded as R, the focal length of the plano-concave cylindrical mirror 5 is recorded as R2, and R2 satisfy the following relations: r2 ═ R/cos (α/2). The angle α between the plane mirror 4 and the plano-concave cylindrical mirror 5 of the present embodiment is 90 °, and R2 satisfy the relationship:
the radius of curvature R of the primary mirror 1 of the present embodiment is 350mm, and the focal length R2 of the plano-concave cylindrical mirror 5 is 495 mm.
As a preferred embodiment of the present embodiment, the plane mirror 4 may be directly bonded to the position of the primary mirror 1 where light is emitted. The size of the main mirror 1 can be reduced, the area of the main mirror 1 where the emergent light spot is located can be cut off, and the plane reflecting mirror 4 can be fixed in the area.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a gaseous white pond of absorbing of formula of multiplying many times, includes primary mirror, two secondary mirrors, light incidence end, emergent ray end, typical white pond, its characterized in that are constituteed to primary mirror, two secondary mirrors, light incidence end, emergent ray end: still include multiplication mirror group, multiplication mirror group includes plane mirror and plano-concave cylindrical reflector, plane mirror is relative and is the contained angle fixed with plano-concave cylindrical reflector's mirror surface, multiplication mirror group accepts the emergent light of secondary mirror to inject typical white pond once more with emergent light offset as new incident light, accomplish and be more than the reflection of typical white pond optical distance one time at least.
2. A multiply multiplied gas absorption white cell according to claim 1, wherein: the primary mirror, the first secondary mirror and the second secondary mirror are spherical mirrors, and the curvature radiuses of the primary mirror, the first secondary mirror and the second secondary mirror are the same.
3. A multiple-multiplication gas-absorbing white cell according to claim 2, wherein: the included angle between the plane mirror and the plano-concave cylindrical mirror is recorded as alpha, the curvature radius of the primary mirror is recorded as R, the focal length of the plano-concave cylindrical mirror is recorded as R2, and R2 satisfy the following relations: r2 ═ R/cos (α/2).
4. A multiple-multiplication gas-absorbing white cell according to claim 3, wherein: the included angle alpha between the plane reflector and the plane-concave cylindrical reflector is 90 degrees, and R2 satisfy the following relation:
5. a multiply multiplied gas absorption white cell according to claim 1, wherein: the plane reflector is directly bonded at the position of the emergent light of the primary mirror, or the size of the primary mirror is reduced, and the plane reflector is fixed in the area where the emergent light deviates from the primary mirror.
6. A multiply multiplied gas absorption white cell according to claim 1, wherein: the light incidence end and the light emergent end are separately arranged on one side of the main mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210420030.2A CN114674752A (en) | 2022-04-21 | 2022-04-21 | Multiply gas absorption white pond |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210420030.2A CN114674752A (en) | 2022-04-21 | 2022-04-21 | Multiply gas absorption white pond |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114674752A true CN114674752A (en) | 2022-06-28 |
Family
ID=82077661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210420030.2A Pending CN114674752A (en) | 2022-04-21 | 2022-04-21 | Multiply gas absorption white pond |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114674752A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115144334A (en) * | 2022-07-12 | 2022-10-04 | 安徽大学 | Gas multi-pass cell based on deformable mirror and control method |
-
2022
- 2022-04-21 CN CN202210420030.2A patent/CN114674752A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115144334A (en) * | 2022-07-12 | 2022-10-04 | 安徽大学 | Gas multi-pass cell based on deformable mirror and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5009493A (en) | Mirror arrangement for a beam path in a multiple-reflection measuring cell | |
| US7259374B2 (en) | Method for detecting a gas species using a super tube waveguide | |
| US3539798A (en) | Shadowless projection systems | |
| US7498575B2 (en) | Optical analysis device | |
| US20080035848A1 (en) | Ultra-high sensitivity NDIR gas sensors | |
| US4988195A (en) | Internal reflectance apparatus and method using cylindrical elements | |
| CN105548014A (en) | Optical absorption device with adjustable double absorption optical paths | |
| US6075246A (en) | Infrared measuring arrangement with expanded measuring range | |
| CN114674752A (en) | Multiply gas absorption white pond | |
| CN211697465U (en) | Optical absorption cell and photoelectric gas analyzer | |
| CN111624182A (en) | Capillary photometer | |
| JP2000193586A (en) | Optical raindrop detector | |
| CN110987803A (en) | Gas absorption pool with flexible structure, adjustable optical path and convenient disassembly | |
| CN217404123U (en) | Multiply type gas absorption white pool | |
| KR20110057651A (en) | Ndir gas sensor | |
| CN110987813B (en) | Combined type optical enhancement absorption cell | |
| CN207571018U (en) | A kind of gas absorption cell light channel structure suitable for fume continuous monitoring system | |
| US4156143A (en) | Device for measuring the concentration of a gas | |
| US11650150B2 (en) | Prism for measuring liquid concentration | |
| CN219200630U (en) | Off-axis optical path system of ultraviolet detector | |
| US3567329A (en) | Gas sample analysis cells | |
| CN110596005A (en) | Novel annular flat concave mirror optical multi-pass absorption pool | |
| CN219552364U (en) | Ultraviolet detector light path system based on prism structure | |
| CN115372300A (en) | Light path system based on gas absorption cell | |
| CA1083380A (en) | Gas concentration measuring device with series radiation paths |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |